test(crypto-worker): increase unit test coverage

[sebastijankuzner]

Summary

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

❌ Patch coverage is 99.08257% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.66%. Comparing base (fe6f3b9) to head (d7fa68b).

Files with missing lines	Patch %	Lines
...ages/crypto-worker/source/worker-implementation.ts	99.05%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1318      +/-   ##
===========================================
+ Coverage    55.81%   56.66%   +0.84%     
===========================================
  Files          967      972       +5     
  Lines        64426    64875     +449     
  Branches      1580     1690     +110     
===========================================
+ Hits         35960    36762     +802     
+ Misses       28237    27881     -356     
- Partials       229      232       +3     

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	56.38% <99.08%> (+0.56%)	⬆️

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